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1.

Let two matrices be A=1−4−2 1,B=0 3 5 8. What is A - B? '1 -7 -7 -7' = Correct 1 / 1 points
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2. 

Let x=5527 What is 2∗x? '10 10 4 14' in Column = Correct 1 / 1 points
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3. 

Let u be a 3-dimensional vector, where specifically u=814. What is uT? '814' in Row = Correct 1 / 1 points
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4. 

Let u and v be 3-dimensional vectors, where specifically u=−343 and v=315.
What is uTv? (Hint: uT is a 1x3 dimensional matrix, and v can also be seen as a 3x1 matrix. The answer you want can be obtained by taking the matrix product of uT and v.) Do not add brackets to your answer. '10' = Correct 1 / 1 points
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5. 

Let A and B be 3x3 (square) matrices. Which of the following must necessarily hold true? Check all that apply.

A+B=B+A Tick = Tick = Correct 

If A is the 3x3 identity matrix, then A∗B=B∗A = Tick = Correct  
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Linear Algebra
5/5 points earned (100%)
